Answer will be only B as it is the group reagent of Group 3
But it does give ppt with Zn too.
With excess NaOH only Zn2+ will be soluble while both Cu2+ and Zn2+ are soluble in excess NH3 and Fe3+ is not
Is it 7
Y is Br2
It is a characteristic test of Br2, that it turns fluorescein paper red